Fire sprinkler apparatus



FIG. 1 is a view in side elevation of the fire sprinkler apparatus of the invention all other side being identical.

FIG. 2 is a view in top plan of the fire sprinkler apparatus of FIG. 1; and,

FIG. 3 is a view in bottom plan of the fire sprinkler apparatus of FIG. 1. 

The ornamental design for a fire sprinkler apparatus, as shown and described. 